BRIDGE 4A+ 19" DI box / line isolation box, 4 channels, active

Item No.: PBRIDGE4APLUS

Series: BRIDGE

For connecting devices with unbalanced or balanced outputs to PA systems

Reliably eliminates ground loop hum thanks to galvanic transformer isolation

Combo inputs, can be used with XLR connectors or 1/4" jacks

2 balanced XLR outputs per channel

Audio over Cat output (AES72 Type 5e) for forwarding all signals via a single Cat cable

Ground-lift switch for each output

Solid 19" housing, 1U

Power supply: 9-18V DC, center negative

Engineered in Germany

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For connecting devices with unbalanced or balanced outputs to PA systems

Reliably eliminates ground loop hum thanks to galvanic transformer isolation

Combo inputs, can be used with XLR connectors or 1/4" jacks

2 balanced XLR outputs per channel

Audio over Cat output (AES72 Type 5e) for forwarding all signals via a single Cat cable

Ground-lift switch for each output

Solid 19" housing, 1U

Power supply: 9-18V DC, center negative

Engineered in Germany

Description

The BRIDGE 4A+ is a multifunctional device: each of the four channels can be used independently as an active DI box, a line isolation box, or a booster. The input combo socket accepts unbalanced and balanced signals. The outputs are designed as two transformer-balanced XLR sockets per channel (one on the front and one on the rear).

The galvanic isolation via transformer eliminates hum loops, and the ground lift switch can also be used to eliminate noise and interference that occurs with already balanced input signals. The Palmer BRIDGE 4A+ reliably eliminates any hum - and when connecting unbalanced equipment, the signal is also balanced.

If necessary, the signal level can be raised in three stages by 6dB, 12dB or 18dB. The audio over Cat output allows the signals of all 4 channels to be routed via a single Cat cable. This saves material, space, and time.

The BRIDGE 4A+ line isolation box is a universal problem solver for eliminating ground loops. Whether it's at home, at lectures, in the rehearsal room, on stage, in clubs, or at large events - the Palmer BRIDGE 4A+ ensures a clean sound without interference anywhere.

Specifications

General data

Product type

DI boxes, Line isolators

Type

active

Transformer isolated

yes

Channels

Inputs

input type

balanced/ unbalanced

Input connectors

6.3 mm jack, XLR

Number of outputs

4 (+ 4 parallel XLR outs + AoC)

THRU outputs/channel

Output type

balanced

Output connectors

RJ45, XLR

Output attenuation (PAD)

0 dB / 20 dB

Cabinet material

sheet steel

Width

482 mm

Width

19 "

Depth

90 mm

Height

44 mm

Height

1 U

Weight

2.1 kg

Ground lift switch

yes

Operating voltage

9 V - 18 V

Power consumption

2 W

Additional Features

6/12/18 dB gain, AoC output with ground lift, power LED

Ambient temperature during operation

-20 - 70 °C

Relative Humidity

< 80% (non-condensing)

Accessories (included)

external power supply PW9V

Audio

Max. input level (< 1% THD, 20 Hz)

+10 dBu

Max. input level (< 1% THD, 1 kHz)

+16 dBu

Max. output level (<1% THD, 20 Hz - 20kHz)

+7 dBu

Frequency response (±0,2 dB, relative 1 kHz)

20 Hz - 20 kHz

Input impedance (1 kHz)

20 kOhm

Output impedance (1 kHz)

84 Ohm(s)

THD + N (30 Hz, +4 dBu, unity, unweighted)

< 0.0023%

THD + N (1 kHz, +4 dBu, unity, unweighted)

< 0.0009%

IMD (SMPTE) (60 Hz / 7 kHz, 4:1, +4 dBu)

< 0.0018%

SNR (+4 dBu, 22 kHz BW, unity, unweighted)

105 dB

Transformer ratio

10 : 1

Name	Category	Type	File size
User manual	Manual	pdf	2 MB
Information sheet	Data Sheet	pdf	3 MB
Palmer Catalogue	Catalog	pdf	31 MB
Product images	Image files	zip	-